Abstract: The development of embryo of Eleutherococcus brachypus belongs to Solanad type.In the late stick embryo stage, the suspensor is most developed.In the globular embryo stage, the suspensor begins to degenerate and its disintegration occurs in the stage of heart embryo.Endosperm is nuclear type.In the stage of about 200~300 free nuclei, endosperm begins to celluarize and its number of cells further increase by mitosis.In the globular embryo stage, the most outer layer of endosperm is specialized to secretory layer.Endosperm cells reserve protein and fat.The most inner layer of single integument is differentiated into endothelium in the stage of 32~64 free nu-clei.After division of zygote, the endothelium fully developed and it is pressed in the late stage of stick embryo.In the globular embryo stage, endo thelium degenerates and the outer layer of integument specialized into seed vessel.

Key words: Eleutherococcus brachypus, Embryo, Endosperm, Endothelium, Development